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    • 5. 发明公开
    • Moisture stable polyurethane biasable transfer members
    • 水分稳定的聚氨酯漂白传递成员
    • EP0544290A3
    • 1993-09-29
    • EP92120199.2
    • 1992-11-26
    • EASTMAN KODAK COMPANY
    • Wilson, John Charles, c/o Eastman Kodak CompanyVreeland, William B., c/o Eastman Kodak Company
    • G03G15/16C08G18/02
    • G03G15/1685C08G18/10C08G18/3225C08G18/6685
    • Electrically biasable transfer members for use in electrostatographic transfer processes for transferring toner images from one support surface to another and methods for their preparation are described. The electrically conductive biasable transfer members comprise a conductive substrate (1) capable of supporting a uniform bias potential thereon and at least one layer or coating (2) of an elastomeric resilient polyurethane formed by reacting (a) a polyisocyanate prepolymer comprising the reaction product of a saturated aliphatic polyiso-cyanate, a saturated cycloaliphatic polyisocyanate, or an aromatic polyisocyanate and a polyol free of aliphatic unsaturation, preferably a polyalkylene glycol in which the alkylene group contains 2 to 8 carbon atoms, and (b) a hardening mixture comprising a polyol of (a) or a diamine free of aliphatic unsaturation, or a mixture thereof and, as a conductivity control agent, from 0.001 to 5.0 weight percent, based on the total weight of (b), of a complex of ethylene glycol or an oligoethylene glycol selected from the group consisting of di-, tri- and tetraethylene glycol with an ionizable ferric halide salt selected from the group consisting of ferric fluoride, ferric chloride and ferric bromide. The resistivity of the elastomeric resilient polyurethane coating (2) on the biasable member is controlled or adjusted to within a desired level of resistivity due to the inclusion of the conductivity control agent in the polyurethane elastomer. Additionally, the inclusion of the conductivity control agent in the polyurethane elastomer reduces the sensitivity of the resistivity of the polyurethane coating on the biasable member to changes in relative humidity. Further, since the conductivity control agent is copolymerized with the polyisocyanate prepolymers and the polyols and/or polyamines which comprise the hardening mixtures used to make the elastomeric polyurethane coatings of the biasable members of the invention, the conductivity control agent is bonded covalently to the polyurethane elastomer matrix or network, that is, to the backbone, crosslinking or branched portion of the polyurethane elastomer, where it forms a permanently fixed part of the polymer and will not migrate therefrom resulting in a continuous change in the resistivity of the polyurethane coating over time and possible adverse affects on materials that may come into contact with the migrating agent.
    • 6. 发明公开
    • Moisture stable polyurethane biasable transfer members
    • 柔韧性,耐磨性,聚氨酯 - Übertragungs-Elemente。
    • EP0544290A2
    • 1993-06-02
    • EP92120199.2
    • 1992-11-26
    • EASTMAN KODAK COMPANY
    • Wilson, John Charles, c/o Eastman Kodak CompanyVreeland, William B., c/o Eastman Kodak Company
    • G03G15/16C08G18/02
    • G03G15/1685C08G18/10C08G18/3225C08G18/6685
    • Electrically biasable transfer members for use in electrostatographic transfer processes for transferring toner images from one support surface to another and methods for their preparation are described. The electrically conductive biasable transfer members comprise a conductive substrate (1) capable of supporting a uniform bias potential thereon and at least one layer or coating (2) of an elastomeric resilient polyurethane formed by reacting (a) a polyisocyanate prepolymer comprising the reaction product of a saturated aliphatic polyiso-cyanate, a saturated cycloaliphatic polyisocyanate, or an aromatic polyisocyanate and a polyol free of aliphatic unsaturation, preferably a polyalkylene glycol in which the alkylene group contains 2 to 8 carbon atoms, and (b) a hardening mixture comprising a polyol of (a) or a diamine free of aliphatic unsaturation, or a mixture thereof and, as a conductivity control agent, from 0.001 to 5.0 weight percent, based on the total weight of (b), of a complex of ethylene glycol or an oligoethylene glycol selected from the group consisting of di-, tri- and tetraethylene glycol with an ionizable ferric halide salt selected from the group consisting of ferric fluoride, ferric chloride and ferric bromide.
      The resistivity of the elastomeric resilient polyurethane coating (2) on the biasable member is controlled or adjusted to within a desired level of resistivity due to the inclusion of the conductivity control agent in the polyurethane elastomer. Additionally, the inclusion of the conductivity control agent in the polyurethane elastomer reduces the sensitivity of the resistivity of the polyurethane coating on the biasable member to changes in relative humidity. Further, since the conductivity control agent is copolymerized with the polyisocyanate prepolymers and the polyols and/or polyamines which comprise the hardening mixtures used to make the elastomeric polyurethane coatings of the biasable members of the invention, the conductivity control agent is bonded covalently to the polyurethane elastomer matrix or network, that is, to the backbone, crosslinking or branched portion of the polyurethane elastomer, where it forms a permanently fixed part of the polymer and will not migrate therefrom resulting in a continuous change in the resistivity of the polyurethane coating over time and possible adverse affects on materials that may come into contact with the migrating agent.
    • 描述了用于将调色剂图像从一个支撑表面转移到另一个支撑表面的电刻转印过程中的电偏移转印元件及其制备方法。 导电的可偏置转印构件包括能够在其上支撑均匀偏压电位的导电基底和弹性聚氨酯弹性聚氨酯的至少一层或涂层,该层或涂层通过使(a)包含饱和脂族聚异氰酸酯的反应产物的多异氰酸酯预聚物 ,饱和脂环族多异氰酸酯或芳族多异氰酸酯和不含脂族不饱和度的多元醇,优选亚烷基含有2至8个碳原子的聚亚烷基二醇,和(b)包含(a)的多元醇或 二胺不含脂肪族不饱和基团,或其混合物,并且作为电导率控制剂,以(b)的总重量为基准,为0.001-5.0重量%的乙二醇或低聚乙二醇的络合物,所述配合物选自 的二,三和四乙二醇与可离子化的卤化铁盐,其选自氟化铁, 氯化铁和溴化铁。 由于在聚氨酯弹性体中包含导电性控制剂,所以可偏压构件上的弹性聚氨酯弹性体涂层的电阻率被控制或调整到期望的电阻率水平。 此外,在聚氨酯弹性体中包含导电性控制剂降低了聚氨酯涂层对可偏压构件的电阻率对相对湿度变化的敏感性。 此外,由于导电性控制剂与多异氰酸酯预聚物和包含用于制备本发明的可偏压构件的弹性体聚氨酯涂层的硬化混合物的多元醇和/或多胺共聚,导电性控制剂与聚氨酯共价键合 弹性体基质或网络,即聚氨酯弹性体的骨架,交联或支化部分,其中它形成永久固定的聚合物部分,并且不会从其迁移,导致聚氨酯涂层随时间的电阻率的连续变化 以及可能与迁移剂接触的材料的可能的不利影响。 这种可偏压构件的用途是将调色剂图像从包括导电支撑表面(例如光导支撑表面或感光体)的静电图像元件转移到最终的支撑片,其中该构件例如偏置转印辊, 与导电支撑表面元件电气配合以在它们之间建立定向力场。